An extragalactic view of the Milky Way neutron star population - and the implications for fast radio bursts
Transient Astrophysics
Ashley
Chrimes
Date Submitted
2021-04-23 00:00:00
Radboud University
A. Chrimes (Radboud), A. Levan (Radboud), P. Groot (Radboud), J. Lyman (Warwick), G. Nelemans (Radboud)
Studies of extragalactic transients often use their offsets from, and locations on, their host galaxies to help infer the nature of their progenitors. In this work, we examine the spatial distribution of neutron stars in the Milky Way, as observed from an extragalactic distance and face-on orientation. Motivated by the association of fast radio bursts with the Galactic magnetar SGR1935, we compare the offset, host-normalised offset, enclosed flux and fraction of light distributions of Milky Way magnetars to FRBs on their hosts. We extend this to other Galactic neutron star populations, including X-ray binaries and pulsars, comparing to a range of extragalactic transients. We find that the fraction of light statistic should be carefully used when making comparisons between transients with different host morphologies, and in different redshift ranges. Our primary result is that Galactic neutron stars are distributed on the Milky Way's light in a manner consistent with FRBs on their host galaxies. While we cannot distinguish which specific population of neutron stars is the best match, the overall results further strengthen the FRB-neutron star connection.
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